Skip to content 
Urethane O-Rings
Urethane O-Ring (Polyurethane – PU, AU, EU) Material Technical Specification
Abrasive polyurethane (PU) elastomers are divided into two categories: polyester-based polyurethane (AU) and polyether-based polyurethane (EU). AU-type polyurethane possesses excellent oil, fuel, and solvent resistance, but its hydrolysis resistance is poor, making it susceptible to hydrolytic degradation. EU-type polyurethane, on the other hand, exhibits good hydrolysis resistance, and its oil and fuel resistance is comparable to low-acrylonitrile (18%–22%) nitrile butadiene rubber (NBR) or hydrogenated NBR.
Compared to other elastomer materials, all types of polyurethane exhibit the core advantages of superior abrasion resistance, high tensile strength, and high elasticity. In terms of products, polyurethane O-rings with hardness specifications of 70 and 90 are available, and various thermoplastic polyurethane (TPU) products can be customized.
Polyurethane O-rings are typically transparent and have an unlimited shelf life, allowing for long-term storage.
Peroxide curing system
Standard polyurethane compounds are cured using peroxide.
Temperature range of polyurethane O-rings:
Standard low temperature: -40°C (-40°F)
Standard high temperature: 80°C (176°F)
Specifications: Polyurethane, Hardness 70
Specifications: Polyurethane, Hardness 90
Preferred application environment for polyurethane O-rings
Performs Well In:
- Aliphatic hydrocarbons
- Mineral oils and greases
- Silicone oils and greases
- Ozone
- Water temperature up to 50ºC (122ºF)
Doesn't Perform Well In:
- Ketones
- Alcohols
- Esters
- Ethers
- Hot water and steam
- Alkalis, Amines
- Acids
- Ethylene glycol